Or Sprinkles... The Dutch put them on a slice of bread. Not cupcakes or ice cream.
Plain old bread.
We decided to try some at home. It was ... underwhelming.
Hagelslag on bread tastes exactly the way one imagines sprinkles on a piece of bread would taste. The experience is not transformative.
However, it is very pretty!
(unless you've ever discovered mouse droppings on a countertop)